A second two-wheel motorist in less than 24 hours died while traveling on the Alaskan Way Viaduct on Thursday afternoon, Seattle police confirmed.

Northbound lanes of the viaduct were closed north of Spokane Street, and police diverted traffic away from the scene, causing hours of delays

The motorist, driving a 500 cc Aprilia motor scooter, was traveling northbound on 99 near South Jackson Street about 2:50 p.m. when the scooter hit a guard rail, ejecting the 52-year-old man, according to police reports.

Seattle Fire Department medics arrived and determined the man died at the scene.

Seattle traffic collision investigators continue to look into the incident.

Wednesday night, a biker was driving northbound on Alaskan Way just before 9:30 p.m. when he was thrown from his bike, landing on Railroad Way South below the temporary ramp that curves up to the viaduct.

The King County Medical Examiner's Office identified the man as 30-year-old Nathaniel Hammer.